Explain why, when air is taken in and let out during breathing, the lungs always contain a residual volume of air.
Answers
PHENOMENON:
Even after the most forceful expiration of air, some residual amount of air (1.5 L) is left in the lungs.
EXPLANATION:
The human trachea (wind-pipe) is made of soft cartilaginous rings. If we exhaled out all the air from our lungs, there would be a vacuum inside the tracheal column, and it would collapse.
Also, the lungs would skrink so much in size that the ribs, which are joined to the lungs by muscles, might crack and get fractured.
The residual air in the lungs prevents these incidents from happening.
Hope this helped! ( It's 2:30 am here. What am I doing with my life?)
Answer:
Respiration is breathing or pulmonary ventilation by which atmospheric air is drawn in and carbon dioxide-rich alveolar air is released out. ... Diffusion of oxygen and carbon dioxide takes place. Residual volume of air is the volume of air remaining in the lungs even after a forcible expiration.